Hmmm... 14 mo DS says:
Dayday (Dayna the dog)
Baby (for himself usually, sometimes for another baby)
Jazzy (sometimes for himself, usually repeating me I think)
Ding (for the bell ornament that rings)
Nana (for nursing)
Bite (as in "Look, I bit the nursie! No? Not funny? Really? Pleeeease can it be funny? Look, I'm smiling about it! No? Waaaaaaaah!")
Na? (for "can I eat this?" Maybe he's trying to say "No?")
Num (for solids)
And this morning, I said something about a picture of bubbles in a book. He looked at me, puzzled, said "Buh? Buh? Buh?", pointed up like he was holding a bubble wand, and went "whooooooo" like he was blowing bubbles!
I got out the bubbles and blew some for him and he clapped and did his little "victory dance" as if to say "yay! I was understood!" (Usually the little backward victory dance signals, "hey, I made it into sister's art area where I'm not supposed to be" or "I pushed the bathroom door open and prevented dad from having privacy on the potty! Hooray for me!")
And he pushes the volume button on the phone, which makes it ring, then holds it up to his ear and has long babbled conversations with "DaDa"
That makes what, 20ish I guess. Most aren't understandable by people other than DH, DD, the sitter, and me though.